In an internet-based program, we often need to determine the legality of an IP string. Legitimate IP is the form: A.B.C.D A, B, C, and D are all integers in [0, 255]. For the sake of simplicity, we specify that no leading zero exists in these four integers, as in 001. Now, please to complete the judgment procedure ^_^ The Input The input consists of several lines, each of which is a string, and the input is terminated by the End of file . The length of the string is up to 30, with no Spaces and no visible characters. The Output For each input, a single output row If the string is legal IP, output YES, otherwise, the output NO

Pongo light the lamp\Makefile.win
....................\main.c
....................\main.o
....................\reading practicing.dev
....................\reading practicing.exe
....................\reading practicing.layout
Pongo light the lamp

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