python3
while True:
try:
row = list(item for item in input().split())
row.sort()
out_str = ''
for i in row:
out_str = out_str+' '+i
print(out_str.strip())
except:
break
try:
row = list(item for item in input().split())
row.sort()
out_str = ''
for i in row:
out_str = out_str+' '+i
print(out_str.strip())
except:
break
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