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\def\fifo#1{\ifx\ofif#1\ofif\fi
\process#1\fifo}
\def\ofif#1\fifo{\fi}
\newcount\n \newcount\m
\def\insertcommas#1{\n=0
\def\process##1{\advance\n1 }\fifo#1\ofif
\m=\n \divide\n3 \advance\n1 \multiply\n3
\advance\n by-\m \ifnum\n=3 \n=0 \fi \advance\n-1
\def\process##1{\advance\n1 \ifnum\n=3 {,}\n=0 \fi ##1}
\fifo#1\ofif}
´ÙÀ½°ú °°ÀÌ ÀÔ·ÂÇϸé,
\insertcommas{1} \insertcommas{12} \insertcommas{123} \insertcommas{1234} \insertcommas{12345} \insertcommas{123456} \insertcommas{1234567} ...
¾Æ·¡¿Í °°Àº °á°ú¸¦ ¾òÀ» ¼ö ÀÖ½À´Ï´Ù.