def trim(str):
length = len(str)
begin_pos = 0
end_pos = length
for i in range(length):
if str[i] != ' ':
begin_pos = i
break
for i in range(-1, 0 - length - 1, -1):
if str[i] == ' ':
end_pos = i
else:
return str[begin_pos:end_pos]
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GARRY2019
def trim(str):
length = len(str)
begin_pos = 0
end_pos = length
for i in range(length):
if str[i] != ' ':
begin_pos = i
break
for i in range(-1, 0 - length - 1, -1):
if str[i] == ' ':
end_pos = i
else:
break
return str[begin_pos:end_pos]