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初级

First Second Last

未完成
初级参考 完整示例代码供参考，建议自己理解后重新输入 
# Write your solution here
def solve(string):
    string = string.split(" ")
    return string[0]        

def second_word(string):
    string = string.split(" ")
    return string[1]

def last_word(string):
    string = string.split(" ")
    return string[-1]

# You can test your function by calling it within the following block
if __name__ == "__main__":
    sentence = "once upon a time there was a programmer"
    print(solve(sentence))
    print(second_word(sentence))
    print(last_word(sentence))

示例

输入
print(solve(sentence))
期望输出
once
upon
programmer
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