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def prime(n):
    for i in range(2,int(n/2)+1):
        if n%i == 0:
            return(0)
        else:
            pass
        return(1)

s = input("请输入a，b值，中间空格隔开：").split(" ")

for i in range(int(s[0]),int(s[1])):
    flag = 0
    le = len(str(i))
    if le==1: 
        if(prime(i)== 1):
            print(i)
    else:
        if(le%2==0):
            r_l = int(le/2) + 1
        else:
            r_1 = int(le/2) +1
        i = str(i)
        for k in range(int(r_l)):
            if(i[k] != i[le-k-1]):
                flag =1
                break
            else:
                pass
        if(flag == 1):
            continue
        else:
            i = int(i)
            if(prime(i)== 1):
                print(i)