t = int(input())

for i in range(t):
    s = input()
    while len(s) != 1:
        tmp = ""
        for i in range(len(s) -1):
            a = int(s[i]) + int(s[i+1])
            b = a // 10  + a % 10
            tmp += str(b)
        s = tmp

    print(s)