Minke, decode

function decode(input) {
    let start = Number(input.shift());
    let end = Number(input.shift());
    let correct = input.shift();
    let text = input.shift();
    let regex = /[A-Z][a-zA-Z]+[A-Z]/;

    let [result] = regex.exec(text);
    let country = result.substr(0,start)+correct.toLocaleLowerCase()+result.substr(end+1).toLocaleLowerCase();
    regex = /(\d{3}\.?\d*)/gm;

    let match;
    let ascii=[];

    while (match = regex.exec(text)) {
        ascii.push(Math.ceil(Number(match[1])));
    }
    let city = String.fromCharCode(ascii.shift()).toLocaleUpperCase();
    for (const asciiElement of ascii) {
        city+= String.fromCharCode(asciiElement);
    }
    console.log(`${country} => ${city}`);
}