How to multiply dictionary values with other values based on the dictionary's key?

[giannis.dafnomilis at gmail.com]

I have the results of an optimization run in the form found in the following pic: https://i.stack.imgur.com/pIA7i.jpg.

How can I multiply the dictionary values of the keys FEq_(i,_j,_k,_l) with preexisting values of the form A[i,j,k,l]?

For example I want the value of key 'FEq_(0,_0,_2,_2)' multiplied with A[0,0,2,2], the value of key 'FEq_(0,_0,_4,_1)' multiplied with A[0,0,4,1] etc. for all the keys present in my specific dictionary.

I have been trying to correspondingly multiply the dictionary values in the form of 
    varsdict["FEq_({0},_{1},_{2},_{3})".format(i,j,k,l)]

but this is not working as the indexes do not iterate consequently over all their initial range values, they are the results of the optimization so some elements are missing. I also could not find something of a similar nature where I looked.

Thank you for the help!