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