import sys
from collections import defaultdict

try:
    import mydebug

    def dprint(*objects):
        print(*objects)
except:
    def dprint(*objects, sep='', end='\n'): pass

a = input()
b = input()
da = defaultdict(int)
db = defaultdict(int)

for c in a:
    da[c] += 1

for c in b:
    db[c] += 1
    
for k, v in da.items():
    if db[k] != v:
        print("NO")
        sys.exit()

print("YES")