n = int(input())
if 10000 <= n < 100000:
    print('wan')
elif 100000 <= n < 1000000:
    print('shi wan')
elif 1000000 <= n < 10000000:
    print('bai wan')
elif 10000000 <= n < 100000000:
    print('qian wan')
elif 100000000 <= n < 1000000000:
    print('yi')
elif 1000000000 <= n < 10000000000:
    print('shi yi')
/**************************************************************
	Problem: 1322
	User: admin
	Language: Python
	Result: Accepted
	Time:175 ms
	Memory:34480 kb
****************************************************************/