function timeConversion(s) {
    // Write your code here
    const ampm = s.slice(-2)
    const h = s.slice(0,2)
    const rest = s.slice(2,-2)
    // console.log(n) // 12
    // console.log(t) // "PM"
    if ( ampm === "PM" ) {
     return h === "12" ? `12${rest}` : `${String(Number(h) + 12)}${rest}`
    } else {
      return h === "12" ? `00${rest}` : `${h}${rest}`
    }
}