d1 = {'a':[1,] , 'b':[2,3]}
d2 = {'c':[3,] , 'b':[4,], 'd':[5,]}
 
def abc(dict1, dict2):
    result = []
    if len(dict1) >= len(dict2):
        for key in dict1.keys():
 
            if key in dict2.keys():
                result.append((key, (dict1[key] + dict2[key])))
 
        return result
    else:
        for key in dict2.keys():
 
            if key in dict1.keys():
                result.append((key, (dict1[key] + dict2[key])))
 
        return result
 
print(abc(d1,d2))

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