str_1 = "leetcode"
str_2 = "loveleetcode"
str_4 = "eeebbbeeem"

# get first unique character
table = {}
def unique(s):
  for _, v in enumerate(s):
    if v in table:
      continue
    else:
      table[v] = s.count(v)
    for _, j in enumerate(table):
      if(table[j]) == 1:
        return s.index(j)
        break
  return -1

print(unique(str_1))