#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: linyuhang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/