include

using namespace std;

int main() {
int num;
cin >> num;

int thousands = num / 1000;
int hundreds = (num % 1000) / 100;
int tens = (num % 100) / 10;
int units = num % 10;
int new_num = thousands * 1000 + tens * 100 + hundreds * 10 + units;
cout << new_num;
return 0;

}