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- #include<stdio.h>
- #include<string.h>
- int main()
- {
- int i;
- long int len;
- char str[1000];
- scanf("%s",&str);
- len = strlen(str);
- for (i=0; i<len; i++)
- {
- if ((len-i) % 3 == 0 && i > 0)
- printf(",");
- printf("%c",str[i]);
- }
- printf("\n");
- }
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