import math
def suShu(n):
    f = True
    for i in range (2, int(math.sqrt(n))+1):
        if n % i == 0:
            f = False; 
    return f and n != 1 

def jdsuShu(n):
        a = n // 10
        b = n % 10
        return suShu(n) and suShu(b*10 +a);
for i in range (10, 100):
        if jdsuShu(i):
                print(i)

/**************************************************************
	Problem: 1513
	User: admin
	Language: Python
	Result: Accepted
	Time:52 ms
	Memory:34480 kb
****************************************************************/