leetcode1002

 class Solution:
     def commonChars(self, A: 'List[str]') -> 'List[str]':
         n = len(A)
         if n == 1:
             return A
         basestr = A[0]
         baselist = {}

         for b in basestr:
             if b not in baselist.keys():
                 baselist.update({b:1})
             else:
                 baselist.update({b:baselist[b]+1})
         for i in range(1,n):
             cur = A[i]
             curlist = {}
             for c in cur:
                 if c not in curlist:
                     curlist.update({c:1})
                 else:
                     curlist.update({c:curlist[c]+1})
             for d in baselist.keys():
                 if d not in curlist.keys():
                     baselist.update({d:0})
                 else:
                     baselist.update({d:min(baselist[d],curlist[d])})
         result = list()
         for e in baselist.keys():
             for f in range(baselist[e]):
                 result.append(e)

         return result