|VK Cup 2012 Wild-card Round 1|
You are given an array of integers written in base radix. Calculate their sum and output it written in the same base.
The first line of the input contains an integer n (1 ≤ n ≤ 10) — the size of the array. The second line contains an integer radix (2 ≤ radix ≤ 36) — the base of the numeral system used. Next n lines contain the elements of the array, one per line.
Each element is a non-negative integer written in radix-based notation, possibly with leading zeros, which contains between 1 and 5 digits, inclusive. The digits of the notation will be 0, 1, ..., 9, A, B, ..., Z in the given order.
Output the sum of array elements in radix-based notation. Use the same format as in the input.