How to use 'get first letter of string python' in Python

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115def first_letters(string):
116 return ''.join(s[0].upper() for s in string.split(" "))

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42def firstUniqChar(self, s):
43 """
44 :type s: str
45 :rtype: int
46 """
47 alphabet = 'abcdefghijklmnopqrstyvwxyz'
48 index = len(s)
49 for c in alphabet:
50 if c in s:
51 l = s.find(c)
52 r = s.rfind(c)
53 else:
54 continue
55 if l == r and l < index:
56 index = l
57 if index == len(s):
58 return -1
59 return index

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