#考虑输出有空字符的情况
def function(string):
s = "";
for n in range(len(string)):
if (n + 1) % 2 != 0:
s = s + string[n];
if len(string) == (n + 1):
print(s);
else:
s = s + string[n];
print(s);
s = "";
def main():
input_str = 'Hello World';
function(input_str);
main()
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