def rev(a):
    return a[::-1]
    
def is_prime(a):
    flag=1
    for i in range(2,int(a**0.5)+1):
        if a%i==0:
            flag=0
            break
    return flag

if __name__ == '__main__':
    m,n=map(int,input().split())
    l=[]
    flag=0
    for i in range(m,n+1):
        if(is_prime(i) and is_prime(int(rev(str(i))))):
            l.append(i)
            flag=1
    print(','.join(map(str, l)))
    if flag==0:
        print("No")