原来:
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa
a a a a
a 输入 a a a
a 命令 abc程序 a a a
a a a a
a a a a
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa
a a a a
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa
结果:
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa
a a a a
a a a aaaaaaaaaa a
a a a a abc a a
a a a aaaaaaaaaa a
a a a a
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa
a a a a
aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa