#include<iostream>
#include<fstream>
using namespace std;
int main(){
	ifstream in;
	ofstream ou;
	in.open("input.txt");
	int n;
	in>>n;
	string a="",b;
	while(in>>b){
		for(int i=0;i<b.length();i++){
			if(b[i]>='A'&&b[i]<='Z')
				b[i]+=32;
			else if(b[i]>='a'&&b[i]<='z')
				b[i]-=32;
		}
		a+=b;
		a+=" ";
	}
	ou.open("output.txt");
	ou<<a;
	return 0;
}