import sys

sys.setrecursionlimit(10 ** 3)


def fortune_telling(S):
    if len(S) == 1:
        return print(S.pop())
    else:
        fortune_S = []
        for i in range(1, len(S)):
            plus = S[i-1] + S[i]
            fortune_S.append(plus // 10 + plus % 10)
        fortune_telling(fortune_S)


def main():
    n = int(input())
    for _ in range(n):
        S = list(map(int, " ".join(input()).split()))
        fortune_telling(S)


main()