OJ Board

I am also getting runtime error, pls anyone tell me where is the bug? is there any critical input output?
#include<stdio.h>
#include<string.h>
int main()
{
long i,j,m,n,c,chng=0,sort[60],var;
char str[60][60],temp[60][60],t,final[60];
while(1)
{
scanf("%ld %ld",&n,&m);
for(i=0;i<m;i++)
{
scanf ...