#include <bits/stdc++.h>
using namespace std;
int main(){
	char s[81];
	gets(s);
	int i;
	char b;
	for(i=0;s[i]!='\0';i++){
		if(s[i]>='a'&&s[i]<='z'){
			s[i]-=32;}
		else{
			if(s[i]>='A'&&s[i]<='Z')
				s[i]+=32;}	
		cout<<s[i];
	}

	return 0;
	}

/**************************************************************
	Problem: 1182
	User: fzy001
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/