#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- string S,T; void solve() { int i,j,k,l,r,x,y; string s; cin>>S; reverse(ALL(S)); x=0; FORR(c,S) { if(x%3==0 && x) T+=','; T+=c; x++; } reverse(ALL(T)); cout<