import sys


def solve():
    T = int(input())
    for test in range(T):
        S = [int(i) for i in input()]
        ans = uranai(S)
        print(ans)


def uranai(S):
    for i in range(len(S) - 1):
        for j in range(len(S) - (i + 1)):
            S[j] = S[j] + S[j + 1]
            if S[j] >= 10:
                S[j] = 1 + S[j] % 10

    return S[0]


def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None


if __name__ == '__main__':
    solve()