h2. Date de intrare

The first line of the input file $police.in$ contains 4 integers: $N$ (the number of semaphores), $R$ (the number of semaphores William can skip), $T$ (the half-period of the semaphores), and $L$ (the length of the street).
 
The second line contains $N$ integers: the coordinates X[i].

The first line of the input file $wordle.in$ contains the only integer $N$. The second line contains $N$ letters $L[i]$: either an uppercase letter of the English alphabet or an underscore.

h2. Date de ieşire

The output file $police.out$ contains a single line with an integer: the minimum time in seconds that will be needed to reach the nest.

The output file $wordle.out$ contains a single line with an integer: the number of possible solutions.

h2. Restricţii

* $N < L &le; 10^9$
* $X[i] < L$, for each semaphore
* $X[i] < X[i+1]$ for each $i$ from $0$ to $n-2$

* For tests worth $15$ more points, $R = 0$.
* For tests worth $15$ more points, $N ≤ 20$ and $L ≤ 1000$.
* For tests worth $25$ more points, $N, T ≤ 100$ and $L ≤ 1000$.
* For tests worth $15$ more points, $N ≤ 300$.
 

h2. Exemplu