m,n = map(int,input().split()); for i in range (m, n+1): a = i // 1000 b = i // 100 % 10 c = i // 10 % 10 d = i % 10 if a == 0 and b - c == c -d: print(i) elif a - b == b -c and b -c == c - d: print(i) /************************************************************** Problem: 1466 User: admin Language: Python Result: Accepted Time:197 ms Memory:34480 kb ****************************************************************/