# 已知50个1998相乘的结果是a,a的各位数的和是b,
b的各位数的和是c,c的各位数的和是d,
# 求d的值

a = 1998 ** 50
print(a)
str_a = str(a)
b = 0
for i in str_a:
    b += int(i)
print(b)
str_b = str(b)
c = 0
for i in str_b:
    c += int(i)
print(c)
str_c = str(c)
d = 0
for i in str_c:
    d += int(i)

print(d)