WA

#include<bits/stdc++.h>
using namespace std;
int n;
string s;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>s;
        int flag=0;
        for(int j=0;j<=s.size()-1;j++)
        {
            if(j==0&&s[j]>='a'&&s[j]<='z'||s[j]>='A'&&s[j]<='Z')
            {
                if(s[j]>='a'&&s[j]<='z')
                {
                    s[j]-=32;
                }
            }
            else if(s[j]>='A'&&s[j]<='Z')
            {
                s[j]+=32;
            }
        }
        for(int j=0;j<=s.size()-1;j++)
        {
            cout<<s[j];
        }
        cout<<endl;
    }
    return 0;
}