Hidden Password

A company hides a password inside a longer string of uppercase letters. That string is called a message, and a message is valid only when it stands in the following relation to the password.

Write the password as $c_1 c_2 \dots c_P$. The characters need not be distinct. Scan the message from the beginning and look for the first character that belongs to the set $\{c_1, \dots, c_P\}$; that character must be $c_1$. Continue from the position just after it and look for the first character that belongs to $\{c_2, \dots, c_P\}$; that character must be $c_2$. The rule continues the same way through $c_3$ and on to $c_P$.

For example, take the password ABC. The message HAPPYBIRTHDAYCACEY is valid.

• A is the first character from $\{A, B, C\}$ to appear. The leading H is not in the set, so it is skipped.
• Looking after that A, the first character from $\{B, C\}$ is B.
• Looking after that B, the first character from $\{C\}$ is C. The A in DAY does not matter because only a C is being searched for at that point, and the remaining A and C in CACEY do not matter because the password is already complete.

For the same password ABC, the message TRAGICBIRTHDAYCACEY is not valid. A is indeed the first character from $\{A, B, C\}$ to appear, but after it the first character from $\{B, C\}$ is C rather than B.

The message HAPPYBIRTHDAY is also not valid for ABC, because no C ever appears.

Repeated letters in the password follow the same rule. For the password SECRET, the message SOMECHORESARETOUGH is valid. The message SOMECHEERSARETOUGH is not valid, because an extra E turns up at the point where an R is expected.

One line holds two strings separated by a space. The first is the password, of length $P$ with $3 \le P \le 8$. The second is the message, of length $S$ with $10 \le S \le 40$. Both strings consist only of uppercase letters, so neither contains whitespace, lowercase letters, digits, or other special characters.

Print a single line. Print PASS if the second string is a valid message for the password, and FAIL otherwise.