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Write a program that generates a series of element information problems. Each problem consists of an atomic number of an element, ranging from 1 to 20.

Your task is to provide information about the element corresponding to the given atomic number. The information includes the element's symbol, name, and classification (whether it is a metal or non-metal).

Write a Python program that generates 20 element information problems

The input file should contain a single line with the atomic number of the element.

The output file should contain a single line with the element's information in the format symbol:name:classification, where symbol is the chemical symbol of the element, name is the name of the element, and classification indicates whether it is a metal or non-metal.