C++ Using STL Multimap - Help with program

I have the following code below using C++ & STL mapcontainers to count the frequency of letters in a given string(with no spaces). The map data structure stores pairs. In this map,the key is each character, and the value is the frequency.

Need help with: I have the code that retrieves the map valuesand displays to the map, now I need to input the same values into amultimap and output the letters in the order of itsoccurrence(amount of times it is repeated within the string).(arranged from: least # of times --- to greatest # of timesrepeated)

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