Using Python 3, I need a function that takes as a parameter a string and returns a dictionary that tabulates how many of each letter is in that string and does not count spaces. The string should contain characters other than letters, but it will only count the letters(it will not count numbers or spaces). The string could even be the empty string (just ""). Lower-case and upper-case versions of a letter should be part of the same count. The keys of the dictionary should be upper-case letters. If a letter does not appear in the string, then it would not get added to the dictionary. If the string is: "AaBb278"
then the dictionary that is returned should contain these key-value pairs:

{'A': 2, 'B': 2}
Do not use the isalpha() funciton, the collection method or the import method.

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Through the process of sedimentation,sediment is turned back to rock to form sedimentation.the process of sedimentation is: > deposition-where fragments were deposited into the river or sea under gravity or travelling agent such as wind or water. > sedimentation-the fragments deposited in the river sedimented and accumulate> compaction-the layers of fragments deposited undergoes compaction due to the weight if the upper layers> cementation-chemical substance of the fragments such as cement dissolved into the water and cement the other fragments together to form sedimentary rock.thus,cementation and compaction are the process.on the other hand, transformation only occur when a rock under goes metamorphism(compaction or extreme heat).while recrystillization occurs when a rock is melted and cooled down,which also requires metamorphism to take place.hope it !