OJ Board

I get the correct result for the 1st case.
then I get wrong answer.
Here is my code.........

#include <stdio.h>

void main()
{
int x,y,a,b,c,d,n,h,t,xn[13];
char im[13][26];
do
{
scanf("%d",&n);

for(a=0;a<n;a++)
for(b=0;b<25;b++)
scanf("%c",&im[a] );
for(a=0;a<n;a++)
{
c=0;
for(b=0;b<25;b ...