import math
import sys


def input():
    return sys.stdin.readline().strip()


def main():
    a,b=input().split()
    
    a,b = '0'*len(b)+a, '0'*len(a)+b
    
    
    for x,y in zip(a,b):
        if x < y:
            print('No')
            return
    print('Yes')
    


if __name__ == "__main__":
    main()