#include <iostream>
#include <cstring>
using namespace std;
int main() {
char sir[1000];
cin.getline(sir, 1000);
int dif = 32;
for(int i = 0; i < strlen(sir); ++i) {
if('A' <= sir[i] && sir[i] <= 'Z') {
sir[i] = sir[i] + dif;
cout << sir[i];
} else {
sir[i] = sir[i] - dif;
cout << sir[i];
}
}
return 0;
}
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