"use strict";
function Main(input) {
    const series = input.split('');
    const ans = series.map(e => {
        if (/[A-Z]/.test(e)) {
            return e.toLowerCase();
        }
        else {
            return e.toUpperCase();
        }
    }).reduce((accum, current) => {
        return accum + current;
    }, "");
    process.stdout.write(ans);
}
//テストの入力を受け取る
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("CapsLock");
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