xxxxxxxxxx
def compress(fullword):
l1 = len(fullword)
if l1<2:
return fullword
output = ""
prev = fullword[0]
count = 1
for s in fullword[1:]:
if s == prev:
count+=1
else:
output += (prev+str(count))
count = 1
prev = s
output += (prev+str(count))
return output if len(output) < len(fullword) else fullword