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#include <cstdio>
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using namespace std;
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char str[1024];
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int main()
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{
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int n;
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scanf("%d%s",&n,str);
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for(int i=1;i<n;i++)
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if(str[i-1]!=str[i]) {
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printf("YES %c%c",str[i-1],str[i]);
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return 0;
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}
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puts("NO");
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return 0;
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} |
