12
 1378
 51202278
 989898989
 4
 7
 9
 6
 8
 12193721
 999999995
 999999999
 11
 999999996
 999999998
 3
 14
 15
 10
 999999994
 1000
 13781378
 5
 999999997
 1000000000
 13
 16
 0

6
 4
 4
 8
 6
 2
 8
 4
 6
 8
 2
 2
 2
 6
 4
 2
 4
 2
 4
 4
 6
 4
 8
 8
 6
 8
 6
 1

function sa(){
        var data = 6;
        var number = 1378;
        for(var i=1;i<data;i++){
            var lastDigit = Number(number.toString()[number.toString().length -1])
            number = lastDigit * 8;
        }
        return Number(number.toString()[number.toString().length -1]);
    }
    print(sa());