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test="sdf+sdf+3423.4"
a=''
for i in reversed(test):
    a=a+i
    if not a.replace('.','').isnumeric():
    	break
print(a[:-1][::-1])

Success #stdin #stdout 0.01s 9992KB

stdin

Standard input is empty

stdout

3423.4

https://ideone.com/jITl3W

language:

Python 3 (python 3.12)

created:

visibility:

public

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