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

}

/**************************************************************
	Problem: 1182
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/