def succ_cat(u):
    n = 0
    c = 1
    l = [c]
    n = n+1
    c =  2*(2*n-1)*c // (n+1)
    l.append(c)
    while (l[-2]+l[-1])%10 != u:
        n = n + 1
        c = 2*(2*n-1)*c // (n+1)
        l.append(c)
    return l