Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

A. Literature Lesson

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputVera adores poems. All the poems Vera knows are divided into quatrains (groups of four lines) and in each quatrain some lines contain rhymes.

Let's consider that all lines in the poems consist of lowercase Latin letters (without spaces). Letters "a", "e", "i", "o", "u" are considered vowels.

Two lines rhyme if their suffixes that start from the *k*-th vowels (counting from the end) match. If a line has less than *k* vowels, then such line can't rhyme with any other line. For example, if *k* = 1, lines *commit* and *hermit* rhyme (the corresponding suffixes equal *it*), and if *k* = 2, they do not rhyme (*ommit* ≠ *ermit*).

Today on a literature lesson Vera learned that quatrains can contain four different schemes of rhymes, namely the following ones (the same letters stand for rhyming lines):

- Clerihew (
*aabb*); - Alternating (
*abab*); - Enclosed (
*abba*).

If all lines of a quatrain pairwise rhyme, then the quatrain can belong to any rhyme scheme (this situation is represented by *aaaa*).

If all quatrains of a poem belong to the same rhyme scheme, then we can assume that the whole poem belongs to this rhyme scheme. If in each quatrain all lines pairwise rhyme, then the rhyme scheme of the poem is *aaaa*. Let us note that it doesn't matter whether lines from different quatrains rhyme with each other or not. In other words, it is possible that different quatrains aren't connected by a rhyme.

Vera got a long poem as a home task. The girl has to analyse it and find the poem rhyme scheme. Help Vera cope with the task.

Input

The first line contains two integers *n* and *k* (1 ≤ *n* ≤ 2500, 1 ≤ *k* ≤ 5) — the number of quatrains in the poem and the vowel's number, correspondingly. Next 4*n* lines contain the poem. Each line is not empty and only consists of small Latin letters. The total length of the lines does not exceed 10^{4}.

If we assume that the lines are numbered starting from 1, then the first quatrain contains lines number 1, 2, 3, 4; the second one contains lines number 5, 6, 7, 8; and so on.

Output

Print the rhyme scheme of the poem as "aabb", "abab", "abba", "aaaa"; or "NO" if the poem does not belong to any of the above mentioned schemes.

Examples

Input

1 1

day

may

sun

fun

Output

aabb

Input

1 1

day

may

gray

way

Output

aaaa

Input

2 1

a

a

a

a

a

a

e

e

Output

aabb

Input

2 1

day

may

sun

fun

test

hill

fest

thrill

Output

NO

Note

In the last sample both quatrains have rhymes but finding the common scheme is impossible, so the answer is "NO".

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Dec/17/2017 17:03:22 (c4).

Desktop version, switch to mobile version.

User lists

Name |
---|