/*
MioRiTA
*/
#define N_MAX 100
#include <iostream>

using namespace std;

char v[N_MAX],ch,b[N_MAX];
int k;

void main()
{
	while((ch = cin.get()) != '\n')
	{
		if(ch >= 'a' && ch <= 'z')
			b[++k] = ch - ('a' - 'A');				//lower to upper
		else
			if(ch >= 'A' && ch <= 'Z')
				b[++k] = ch + ('a' - 'A');
	}

	for(int i = 1; i <= k; ++i)
		cout << b[i] ;
	cout << endl;
}