OJ Board

Thanks a lot. That should be one of my mistakes.

I got WA.
Anyone tell me why, please?

#include<iostream>
#include<stack>
#include<string>
using namespace std;

int main()
{
string t;
while(cin>>t){
stack<char> s;
int q=0;
for(int i=0;i<t.size();i++){
if(t[i]<'a')
s.push(t[i]);
else{
q++;
}
while(q>1){
if(s.empty()){
i=t.size ...