OJ Board

I can;t find any problem with my code.can anyone help me?
#include<iostream>
#include <sstream>
#include<cstdio>

using namespace std;

int main()
{
int t;
scanf("%d",&t);
string s;
getline(cin,s);
for(int i=1;i<=t;i++){
getline(cin,s);
if(s.length()>=4){
istringstream iss(s);
char c1,c2 ...