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Matcom Online Grader
Faculty of Mathematics and Computer Science of University of Havana
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You are given a
Input
The input contains one line with the string
Output
If S consists of exactly two kinds of characters which both appear twice in S print "Yes", otherwise print "No" (without the quotes).
Sample test(s)
Input
ASSA
Output
Yes
Input
STOP
Output
No
Input
FFEE
Output
Yes
Input
FREE
Output
No