# -*- coding: utf-8 -*-
import sys,copy,math,heapq,itertools as it,fractions,re,bisect,collections as coll

def pascal(n):
    line = [1]
    for k in xrange(n):
        line.append(line[k]*(n - k)/(k + 1))
    return line

T = int(raw_input())
for loop in xrange(T):
    S = raw_input()
    N = len(S)
    if N == 1:
        print S
        continue
    p = pascal(N - 1)
    X = 0
    for i, s in enumerate(S):
        X += int(s)*p[i]
    ans = 0
    for x in str(X):
        ans = ans + int(x)
        if ans >= 10:
            ans = ans%10 + 1
    print ans