#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
char S[ 200 ];
char T[ 200 ];
char C;

	cin >> S;

	i = 0;
	do
	{
		C = S[ i ];
		if( C >= 'a' && C <= 'z' )
			T[ i ] = C + ( 'A' - 'a' );
		else if( C >= 'A' && C <= 'Z' )
			T[ i ] = C + ( 'a' - 'A' );
	}
	while( C != '\0' );

	cout << T << endl;

	return 0;
}