Check if certain characters is found not in the list

I can I check if this text: c45s1JH5E4LHF5PLiVFm has a character that is not listed in the characters of this text aBcD45Fg7H8iJLm45Pq7R8suV4y5Z

For example the text c45s1JH5E4LHF5PLiVFm has two characters 1 and E, which is not listed in aBcD45Fg7H8iJLm45Pq7R8suV4y5Z How can I echo 1 and E?

I want this in PHP Thanks in advance...