def f(a):
    m = [[x] for x in a]
    b = m[:]
    for i in range(len(b) - 1):
        b[i+1] += b[i]
    return sum(len(x) for x in m)

print(f([1, 2, 3, 4]))

lst = list(range(10))
for c in lst[::-2]:
    print(c, end='A')
print()

i = input("입력 = ")
x = []
for w in i.split():
    x.append(w[::-1])
y = ' '.join(x)
z = ''.join(c for c in y if c not in "ong")
print(z)