OJ Board

My code is :
[c]
#include<stdio.h>
#include<string.h>

void main()
{
char string[81];

int period=0,N,counter,length,index,flag;

scanf("%d",&N);

for(counter = 1; counter <= N; counter++)
{
scanf("%s",&string);

length = strlen(string);

for(index = 0; index < length; index++)
{
period ...