'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}



function main() {
    const S = readLine();
    
    try {
        
        console.log(parseInt(S).toString().replace('NaN', 'Bad String'));
    } catch (err) {
        console.log("Bad String");
    }
}