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Is there any test case my code can't handle?
A little help plz.

Here's my code :

C:

#include<stdio.h>
#include<string.h>
int i,len,num[15],step;
char s[20][82];
void main(){
while(scanf("%s",&s[1])){
if(!strcmp(s[1],"-1")) break;
len=strlen(s[1]);
for(step=2;step<=16;step++){
memset(num,0,20 ...

Never mind it. Found the bug.
Thanx anyway to those who tried to help me.