import numpy as np


def f(x: int) -> int:
    return x % 10 + x // 10


def main():
    t = int(input())
    for _ in range(t):
        arr = np.array(list(map(int, list(input()))))
        while len(arr) > 1:
            tmp = np.add(arr, np.roll(arr, -1))
            arr = np.array([f(x) for x in tmp[:-1]])
        print(arr[0])


if __name__ == "__main__":
    main()