from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
println = stdout.write

def main():
    N = int(input())
    S = [list(map(int, list(input()))) for _ in [0] * N]

    for s in S:
        l = len(s)
        for i in range(1, l):
            for j in range(l - i):
                s[j] = sum(divmod(s[j] + s[j+1], 10))
        println(str(s[0]) + '\n')

main()