#include<iostream>
#include<string>

using namespace std;

int main(){
    char smallalph[]="abcdefghijklmnopqrstuvwxyz"
    , bigalph[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	, inputalph[101],outputalph[101];
    int inputLength = 0, i,j;

    cin >> inputalph;
    while(inputalph[inputLength] != '\0'){
	inputLength++;
    }
    for(i=0;i<inputLength;i++){
	for(j=0;j<26;j++){
	    if(smallalph[j] == inputalph[i]){
		outputalph[i] = bigalph[j];
	    }else if(bigalph[j] == inputalph[i]){
		outputalph[i] = smallalph[j];
	    }
	}
    }
    cout << outputalph << endl;
    return 0;
}