import sys
def main():
    text=[]
    for i in range(2):
        text.append(sys.stdin.readline())
    
    strlist_a = []
    for i in text[0]:
        strlist_a.append(i)
    strlist_b = []
    for i in text[1]:
        strlist_b.append(i)
    
    strlist_a.sort()
    strlist_b.sort()
    
    try:
        for i in range(10):
            if strlist_a == strlist_b:
                result = "YES"
                continue
            else:
                result = "NO"
                break
    finally:
        print(result)
        
if __name__ == "__main__":
    main()