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// Noic - Iniciante - Semana 55 - Problema 2 | |
// O(N) | |
#include <bits/stdc++.h> | |
using namespace std; | |
int main(){ | |
//um representa a quantidade de 1's, e dois a quantidade de 2's | |
int n, um=0, dois=0; | |
cin >> n; | |
for(int i=1; i<=n; i++){ | |
int x; | |
cin >> x; | |
if(x==1)um++; | |
else dois++; | |
} | |
if(dois==0){ | |
for(int i=1; i<=n; i++){ | |
cout << 1 << " "; | |
} | |
return 0; | |
} | |
else if(um==0){ | |
for(int i=1; i<=n; i++){ | |
cout << 2 << " "; | |
} | |
return 0; | |
} | |
for(int i=1; i<=n; i++){ | |
if(i==1){ | |
cout << 2 << " "; | |
dois--; | |
} | |
if(i==2){ | |
cout << 1 << " "; | |
um--; | |
} | |
if(i>=3){ | |
if(dois>=1){ | |
cout << 2 << " "; | |
dois--; | |
} | |
else{ | |
if(um>=1){ | |
cout << 1 << " "; | |
um--; | |
} | |
} | |
} | |
} | |
return 0; | |
} |
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