#include <stdio.h>

void main()
{
	int i = 0 ;
	char string[100];
	char capital = '\0';
	int offset = 0;

	scanf("%s", string);
	for(i = 0; i < string[i]; i++)
	{
		if((string[i] >= 'A' && string[i] <= 'Z'))
		{
			capital = string[i];
			offset = capital - 'A';
			break;
		}
	}

	for(i = 0; i < string[i] && capital; i++)
	{
		if((string[i] == offset + 'A' || string[i] == offset + 'a'))
		{
			string[i] = string[i] == offset + 'A' ? offset + 'a' : offset + 'A';
		}
	}

	printf("\n%s\n", string);
	scanf("%s", string);
}