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  1. test="sdf+sdf+3423.4"
  2. a=''
  3. for i in reversed(test):
  4. a=a+i
  5. if not a.replace('.','').isnumeric():
  6. break
  7. print(a[:-1][::-1])
Success #stdin #stdout 0.01s 9992KB
stdin
Standard input is empty
stdout
3423.4