function lab1_4() {
    var a = prompt('Введите a', 0);
    var b = 0;
    var arr = [];
  var arrf = [];
    var i = 0;
    var j = 0;
    i = +i;
    j = +j;
    a = +a;
    b = +b;
    while (a >= 1) {
        b = a % 10;
        a = Math.floor(a/10);
        arr[i] = b;
    for (j = 0; j < arr.length; j++){
        if (arr[j] == arr[i]){
            break;
        }
        alert(arr);
    arr.push(b);
    }
        i++;
    }
    i = 0;
  b = 0;
  alert(arr);