What is the room number of the ancient inn?

In the past, I used to use thousands of words, "The heavens and the earth are mysterious and yellow, the universe is vast, the sun and the moon are like clouds, columns are left at dawn, cold comes and summer goes, autumn harvest and winter storage ...". Qian Wen Zi is an early textbook of Mongolian studies in China. According to legend, Liang Wudi and Xiao Yan in the Southern Dynasties ordered Zhou Xingsi (? -521) Wang Xizhi's 1000 words, taken from Tuo, were compiled into four-character poems. Since the Sui and Tang Dynasties, it has been widely circulated, so that documents are compiled with "Heaven and Earth Xuan Huang" instead of numbers.

Heaven is the first of thousands of words, so Tian Zi ranks first, Di Zi ranks second, Zi Xuan ranks third, Huang Zi ranks fourth, Jade Son ranks fifth, Zhou Zi ranks sixth and so on.

The idiom Tian Zi is the first

In the past, for numerous and varied things, the word "Tian" was often used to arrange the order, and "No.1" was the first word in the first sentence of "money", so "No.1" was the first or the best and strongest meaning.