#include<iostream>
#include<cctype>
using namespace std;

int main ()
{ 
    char input[15];
    cout << "Enter a character : ";
    cin >> input;
    
    for (int i=0 ; input[i] != '\0';i++)
    {
    	if (islower (input[i]))
    	  input[i] = toupper (input[i]);
    	else 
    	  input[i] = tolower (input[i]);
	}
    
    cout << input;
    return 0;
}