function arrInt(arr) {
    return arr.map(str => parseInt(str, 10));
}
function Main(input) {
    const src = input.replace("\n", "");
    const abc = arrInt([...src]).sort((a, b) => a - b);
    const ans = abc[2] - abc[0];
    console.log(ans);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));