# No.432 占い(Easy)
t = int(input())
s = [input() for i in range(t)]
s_dash = ''

for j in range(t):
    tmp = 0
    while len(s[j]) > 1:
        for i in range(len(s[j]) - 1):
            tmp = int(s[j][i]) + int(s[j][i + 1])

            if tmp >= 10:
                s_dash += str(tmp // 10 + tmp % 10) 
            else:
                s_dash += str(tmp)

        s[j] = s_dash
        s_dash = ''
    print(s[j])