11534번 - Hidden Password 다국어

Insecure Inc. has decided to shift directions after a failed attempt at developing a new encryption standard. Their new effort is a password system used to hide a password inside another string of characters we denote as a message. However, it is important that the message has a certain property relative to the hidden password.

Let us assume that we denote the characters of the password as c₁c₂ . . . c_P (although those characters need not be distinct). To be a valid message for the password, if you start from the beginning of the message and search for any character from the set {c₁, . . . , c_P}, it must be that c₁ is the first that you find. Subsequently, if you continue looking from that point of the message for any character from the set {c₂, . . . , c_P}, it must be that c₂ is the next that you find. Continuing in that manner, c₃ must be the next character from the set {c₃, . . . , c_P}, and so on until reaching c_P.

For example, if the password is ABC, then the string HAPPYBIRTHDAYCACEY is a valid message.

• Notice that A is the first of the set {A, B, C} to appear in the message. (The initial H is not relevant.)
• Following the A that was found, the next occurrence from the set {B, C} is B.
• Following the B that was found, the next occurrence from the set {C} is indeed C. (Note that the A in DAY is not relevant, since we are only looking for a C at this point, and the additional A and C in CACEY are not relevant, because we have already completed the password with the first C.)

However, for the password ABC, the string TRAGICBIRTHDAYCACEY is not a valid message.

• While the A is the first of the set {A, B, C} to appear in the string, the next occurrence from the set {B, C} is C rather than B.

Also, the string HAPPYBIRTHDAY is not a valid message for the password ABC because the C never appears.

As an example with duplicate letters in the password, consider the password SECRET. For this password, the string SOMECHORESARETOUGH is a valid message. In contrast, the string SOMECHEERSARETOUGH is not a valid message, because an extraneous E is found at the point when an R is first expected.

The input consists of a single line containing two strings. The first string is the password, having length P, with 3 ≤ P ≤ 8. The second string has length S, with 10 ≤ S ≤ 40. Both strings will consist solely of uppercase letters. (That is, neither string can include whitespace, lowercase letters, digits, or other special characters.)

Output a single line with the word PASS if the second string is a valid message for the password, or FAIL otherwise.