#include <stdio.h>
#include <string.h>

char *substring(size_t start, size_t stop, const char *src, char *dst, size_t size) {
    int count = stop - start;
    if ( count >= --size ) {
        count = size;
    }
    sprintf(dst, "%.*s", count, src + start);
    return dst;
}

int main(int argc, char *argv[]) {
    char arrS[12][4];
    char dec[128];
    int decPos;
    int arrPos = 11;
    for(int i = (strlen(argv[1]) - 1); i >= 0; i--) {
        if(argv[1][i] == '.')
            decPos = i;
    }
    for(int i = decPos - 3; i >= 0; i -= 3) {
        substring(i, i+3, argv[1], arrS[arrPos], sizeof(argv[1]));
        arrPos--;
    }
    printf("%s    %s", arrS[11], arrS[10]);
}