#include<bits/stdc++.h>
using namespace std;
int main()
{
int k;
cin>>k;
while(k--)
{
string a;
cin>>a;
for(int i=0;i<a.size();i++)
{
if(a[i]>='A'&&a[i]<='Z')
{
a[i]=a[i]+32;
cout<<a[i];
}
else
{
a[i]=a[i]-32;
cout<<a[i];
}
}
cout<<"\n";
}
return 0;
}
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