function timePlusMins(input) {
    let h = Number(input.shift());
    let m = Number(input.shift()) + 15;

    if (m < 60) {
        if (m < 10) {
            console.log(`${h}:0${m}`);
        } else if (m > 10) {
            console.log(`${h}:${m}`);
        }
    } else if (m >= 60){
        h += 1;
        m = m % 60;
        if (m < 10) {
            console.log(`${h}:0${m}`)
        } else if (m > 10) {
            console.log(`${h}:${m}`)
        }
    }
}

timePlusMins(["1", "46"])