def solve():
    S = list(map(int, input()))
    l = len(S)
    for i in range(l - 1, 0, -1):
        for j in range(i):
            S[j] += S[j + 1]
            if S[j] >= 10:
                S[j] = S[j] % 10 + 1
    print(S[0])
    
for _ in range(int(input())):
    solve()