def solve(s):
    while len(s) > 1:
        new_s = ""
        for i in range(len(s) - 1):
            d = int(s[i]) + int(s[i + 1])
            if d >= 10:
                d = int(str(d)[0]) + int(str(d)[1])
            new_s += str(d)
        s = new_s

    return s


def main():
    t = int(input())
    for _ in range(t):
        s = input()
        print(solve(s))


if __name__ == '__main__':
    main()