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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- string str;
- cin >> str;
- int len = str.length();
- for (int i=0; i<len; i++)
- {
- if ((len-i) % 3 == 0 && i > 0)
- printf(",");
- printf("%c",str[i]);
- }
- printf("\n");
- }
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