#include <bits/stdc++.h>
using namespace std;
int main()
{
	char a[81];	
	int i;
	cin>>a;
	for(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: 21A
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/