Wa了23点求助

#include<bits/stdc++.h>
using namespace std;
int main()
{
	stack <unsigned long long> a;
	unsigned long long n,x,v;
	string s;
	cin>>n; 
	for(unsigned long long i=1;i<=n;i++)
	{
		cin>>x;
		for(unsigned long long j=1;j<=x;j++)
		{
			cin>>s;
			if(s[0]=='p'&&s[1]=='u')
			{
				cin>>v;
				a.push(v);
			}
			else if(s[0]=='p'&&s[1]=='o')
			{
				if(a.size()==0)
				{
					cout<<"Empty"<<endl; 
				}
				else a.pop();
			}
			else if(s[0]=='q')
			{
				if(a.size()==0)
				{
					cout<<"Anguei!"<<endl; 
				}
				else cout<<a.top()<<endl;
			}
			else if(s[0]=='s')
			{
				cout<<a.size()<<endl;
			}
		}
	}
	return 0;
 }