def sum(x,y):
    if int(x) + int(y) < 10:
        return int(x)+int(y)
    else:
        return (int(x)+int(y))//10 + (int(x)+int(y))%10

n = int(input())
for i in range(n):
    num = list(input())

    while len(num) > 1:
        ls= []
        for i in range(len(num)-1):
            ls.append(sum(num[i], num[i+1]))
        num = ls
    print(ls[0])