Intercepting Information

Spies Breaching Computers (SBC) is a private digital spy agency that is developing a new device for intercepting information using electromagnetic waves, which allows spying even without physical contact with the target.

The device tries to collect information one byte at a time, this is, a sequence of $8$ bits where each of them, naturally, can have a value of $0$ or $1$. In certain situations, due to interference from other devices, the reading cannot be done successfully. In this case, the device returns the value $9$ for the corresponding bit, informing that the reading could not be performed.

In order to automate the recognition of the information the device reads, a request was made for a program that, based on the information read by the device, informs whether all bits were read successfully or not. Your task is to write this program.

The input consists of a single line, containing $8$ integers $N\_1$, $N\_2$, $N\_3$, $N\_4$, $N\_5$, $N\_6$, $N\_7$ and $N\_8$, indicating the values read by the device ($N\_i$ is 0, 1 or 9 for $1 ≤ i ≤ 8$).

Print a single line containing the capital letter “S” if all bits are read successfully; otherwise print a single line containing the capital letter “F”, corresponding to a failure.