def firstNonRepeatingCharacter(str1):
  character_order = []
  count = {}
  for ch in str1:
    if ch in count:
      count[ch] += 1
    else:
      count[ch] = 1 
      character_order.append(ch)
  for ch in character_order:
    if count[ch] == 1:
      return ch
  return None

str1 = "abcabcedydej"
x = firstNonRepeatingCharacter(str1)
print(x)

# Coded By Dhiraj Shelke