def func(s):
    l = []
    for i in range(len(s) - 1):
        p = s[i] + s[i+1]
        pp = p if p < 10 else int(str(p)[0]) + int(str(p)[1])
        l.append(pp)
    return l

t = int(input())

for i in range(t):
    s = list(map(int, list(input())))

    while True:
        if len(s) == 1:
            print(*s)
            break

        s = func(s)