function Main (input) {
    var lineLength = input.length;
    var line = input.split("")

    rapt(line,lineLength);
}

function rapt(line,lineLength){
    var afterLine;
    for (var i= 0; i<= lineLength -1; i++)
        if (line[i].charCodeAt() >=65 && line[i].charCodeAt() <= 90){
                line[i] = line[i].toLowerCase();
        } else {
                line[i] = line[i].toUpperCase();
        };
    afterLine = line.join("")
    console.log(afterLine)
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));