def magico(xs):

    #print(soma(xs),soma2(xs),diag(xs))
    if(soma(xs) == soma2(xs) == diag(xs) != -1 ):
        return True
    else:
        return False

def soma(xs):

    sant = 0
    s = 0
    for i in range(len(xs)):
        if(s != sant):
            return -1
        s = 0
        for j in range(len(xs)):
            s = s + int(xs[i][j])
        sant = s
    return s

def soma2(xs):

    s = 0
    sant = 0
    for j in range(len(xs)):
        if(s != sant):
            return -1
        s = 0
        for i in range(len(xs)):
            s = s + int(xs[j][i])
        sant = s
    return s

def diag(xs):

    s = 0
    for i in range(len(xs)):
        s = s + int(xs[i][i])
    t = 0
    for i in range(len(xs)):
        t = t + int(xs[i][len(xs) - 1 - i])
    if(s == t):
        return s
    else:
        return -1