the code is :
function int__ {
set .@num, atoi(""+getarg(0));
if ( .@num == 0 || .@num >= 2147483647 ) return getarg(0);
set .@l, getstrlen(""+.@num);
for ( set .@i,0; .@i < .@l; set .@i, .@i + 1 ) {
set .@num$, .@num % pow(10,.@i+1) / (10**.@i) + .@num$;
if ( (.@i+1) % 3 == 0...