Can you crack the logic

If 1 1 1 1= R
2 2 2 2= T
3 3 3 3= E
4 4 4 4= N
Then
5 5 5 5= ?

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JohnnyRingo · 51-55, M

Last letters in the added numbers
4=r
8=t
12=e
16=n
20=Y
Answer is Y