for _ in range(int(input())):
    n=[*map(int,[*input()])]
    while len(n)>1:
        temp=[]
        for i in range(1,len(n)):
            t=n[i-1]+n[i]
            if t>=10:
                a,b=[int(i) for i in str(t)]
                t=a+b
            temp.append(t)
        n=temp
    print(*n)