Problem 1B Error - Codeforces

#	User	Rating
1	ecnerwala	3648
2	Benq	3580
3	orzdevinwang	3570
4	cnnfls_csy	3569
5	Geothermal	3568
6	tourist	3565
7	maroonrk	3530
8	Radewoosh	3520
9	Um_nik	3481
10	jiangly	3467

#	User	Contrib.
1	maomao90	174
2	awoo	164
2	adamant	164
4	TheScrasse	159
4	nor	159
6	maroonrk	156
7	-is-this-fft-	150
8	SecondThread	147
9	orz	146
10	pajenegod	145

I have this code for problem 1B in python but in the test 7, runtime error occurs (Exit code 1).↵
What is the problem?↵
↵
def Diagnose (s) :  ↵
    l=len(s);↵
    b=True;↵
    if (s[0]=="R") :↵
        if ("A" < s[1] < "Z") :↵
            ss=Type_1(s);↵
        else :↵
            for i in range(l):↵
                if (s[i]=="C"):↵
                    ss=Type_2(s,i);↵
                    b=False;↵
                    break;↵
            if (b==True):↵
                ss=Type_1(s);↵
    else :↵
        ss=Type_1(s);↵
    return(ss);↵
↵
↵
def Type_1 (s) :    #Example : BCS23↵
    n=0;    ↵
    while ( "A" <= s[n] <= "Z"):↵
        n=n+1;↵
    st=n;   ↵
    col=0;↵
    for i in range (n) : ↵
        col = col + (26**i) + ((ord(s[i])-ord("A")) * (26 ** (n-1)));↵
        n=n-1;↵
    col=str(col);↵
    ss=s[st:len(s)];↵
    return ("R" + ss + "C" + col);↵
↵
↵
↵
def Type_2 (s,i) :↵
    ss="";↵
    st = str(s[1:i]);↵
    col = int(s[i+1:len(s)]);↵
    n=1;↵
    while ((col-(26**n)) > 0) :↵
        col =  col — (26**n);↵
        n=n+1;↵
    c = 0;↵
    for i in range (n-1,-1,-1) :↵
        v=0;↵
        while ( col > (26**i) ) :↵
            col =  col — (26**i);↵
            v=v+1;↵
        ss=ss+chr(v+ord("A"));↵
    ss=ss+st;↵
    return ss;↵
   ↵
s = [None] * 10**5;↵
↵
n = int(input());↵
for i in range(n):↵
    s[i]=input();↵
for i in range(n):↵
    s[i]=Diagnose(s[i]);↵
for i in range(n):↵
    print(s[i]);↵
↵