i = "HumanDev"
x = []
for word in i.split():
x.append(word)
y = ''.join(x)
z = ''.join(c for c in y[::-1] if c not in 'ong')
print(z)
# i.split : 공백을 기준으로 나눔
# ''.join(x) : x에서 공백을 없애고 합쳐라
# ex) x = [human, dev] -> humandev
# 문자열[시작 : 끝 : 변화값] : -1은 뒤에서부터
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