class Queue {
  constructor() {
    this.result = [];
  }
  enque(value) {
    this.result.push(value);
  }

  dequeue() {
    if (this.result.length != 0) {
      this.result.shift();
    }
  }

  print() {
    if (this.result.length != 0) {
      console.log(this.result[0]);
    }
  }
}
function processData(input) {
  let inputArr = input.split("\n");
  let tab = new Queue();
  for (let i = 1; i < inputArr.length; i++) {
    switch (inputArr[i][0]) {
      case "1":
        let value = inputArr[i].slice(1).trim();
        tab.enque(value);
        break;
      case "2":
        tab.dequeue();
        break;
      case "3":
        tab.print();
        break;
    }
  }
}