Write a program which reads a long text from the user as lines until the user puts a dot (.) in the end. Then the program should print the most frequent letter in the text (which repeats more than the others).
Note that the space character is not a letter.

Assumptions: Examples:
INPUT OUTPUT
yaz dostum
yoksul gorsen besle kaymak bal ile
garipleri giydir ipek sal ile
oksuz gorsen sar kanadin kolunu
kimse gocmez bu dunyadan mal ile.
a
ilim ilim bilmekdir
ilim kendini bilmekdir
sen kendini bilmez isen
ha bir kuru emekdir.
i
lale ile leylak.
l


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