s = open('24-181.txt').readline().split('Y') 
 max_ = 0 
 for i in s: 
     if i.count('.') <= 5: 
         max_ = max(max_, len(i)) 
 print(max_) 
 

 
 # s = open('24-181.txt').readline() 
 s = 'A.AA.AAA.AAAA.AAAAA.YA.AA.AAAAAAA.AAA.AAAA.AAAAA.AAAAAA.AAAA' 
 s = s.split('Y') 
  
 print(s) 
 max_ = 0 
 for i in s: 
     if i.count('.') <= 5: 
         max_ = max(len(i), max_) 
     else: 
         ri = i 
         li = i 
         while li.count('.') > 5: 
             li = li[li.find('.')+1:] 
         max_ = max(len(li), max_) 
         while ri.count('.') > 5: 
             ri = ri[:ri.find('.')] 
         max_ = max(len(ri), max_) 
 print(max_)