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MAX=1000;
def replace_spaces(string):
string=string.strip()
i=len(string)
space_count=string.count(' ')
new_length = i + space_count*2
if new_length > MAX:
return -1
index = new_length-1
string=list(string)
for f in range(i-2, new_length-2):
string.append('0')
for j in range(i-1, 0, -1):
if string[j] == ' ':
string[index] = '0'
string[index-1] = '2'
string[index-2] = '%'
index=index-3
else:
string[index] = string[j]
index -= 1
return ''.join(string)
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