alphs = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
d = dict()
i = 0
for alph in alphs:
    d[alph] = i
    i += 1

n = int(input())
s = input()

ans = ''
for i in range(n):
    idx = d[s[i]]
    ans += alphs[25 - idx]
print(ans)