def f(a, b):
    c = a + b
    if c >= 10:
        return 1 + (c % 10)
    else:
        return c

t = int(input())
for i in range(t):
    s = list(map(int, ''.join(input())))
    while len(s) > 1:
        for j in range(len(s) - 1):
            s[j] = f(s[j], s[j + 1])
        s.pop()
    print(*s)