a,b=$<.map &:to_i
c=b%4
p case d=a%10
when 2;[2,4,8,6][c]
when 3;[3,9,7,1][c]
when 4;[4,6,4,6][c]
when 7;[7,9,3,1][c]
when 8;[8,4,2,6][c]
when 9;[9,1,9,1][c]
else d end