def exec(s_list: list) -> list:
    """
    [3,7,3,5,...]
    ⇨ [1,1,8,....]
    """
    result_list = []
    for k in range(len(s_list)-1):
        sum = int(s_list[k]) + int(s_list[k+1])
        if sum >= 10:
            sum = sum - 10 + 1
        
        result_list.append(sum)
    return result_list



def main():
    n = input()
    s = []
    for i in range(int(n)):
        s.append(input())

    for j in s:
        
        s_list = list(j)

        while len(s_list) > 1:
            s_list = exec(s_list)
        print(*s_list,sep = ',')