n = int(input())
L = list(map(int,input().split()))
s = list(input())
r = []
for i in L:
if i ==0:
r.append(" ")
elif 1<=i<=26:
r.append(chr(ord('A')+i-1))
elif 27<=i<=52:
r.append(chr(ord('a')-27+i))
s.sort()
r.sort()
if s==r:
print("y")
else:
print("n")