#include <iostream>
#include <cctype>
using namespace std;
int main()
{
	int i;
	char input[15];
	
   	cout<<"Enter a word ";
   	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;
}