retrieve key field in dictionary from value

Hello everyone.

I want to retrieve the key field in the dictionary(queried from cdt) based on the value present.

I have the data set in following order.


txt1    112      (Number (Decimal))

txt2    113     (Number (Decimal))

txt3    114    (Number (Decimal))

txt4    115   (Number (Decimal))

Input: 115

expected output: txt4

Please help me in getting the answer.

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