Cinema Tickets

function solve(input) {
  let totalTickets = 0;
  let studentTickets = 0;
  let standardTickets = 0;
  let childTickets = 0;
  let index = 0;
  let command;

  while((command = input[index]) !== "Finish") {
    let currentMovie = command;
    index++;
    let totalSeats = Number(input[index]);
    index++;
    let command2;
    let usedSeats = 0;
    while(((command2 = input[index]) !== "End") && totalSeats > usedSeats) {
      let ticketType = command2;
      index++;
      usedSeats++;
      if (ticketType === "student") {
        studentTickets++;
      } else if (ticketType === "standard") {
        standardTickets++;
      } else if (ticketType === "kid") {
        childTickets++;
      }
    }
    console.log(`${currentMovie} - ${((usedSeats)/totalSeats*100).toFixed(2)}% full.`);
    if (command2 === "End") {
      index++;
    }
  }
  totalTickets = studentTickets+standardTickets+childTickets;
  console.log(`Total tickets: ${totalTickets}`);
  console.log(`${(studentTickets/totalTickets*100).toFixed(2)}% student tickets.`);
  console.log(`${(standardTickets/totalTickets*100).toFixed(2)}% standard tickets.`);
  console.log(`${(childTickets/totalTickets*100).toFixed(2)}% kids tickets.`);
}