#include <stdio.h>
int main()
{
char poem[4][22];
for (int i=0; i<4; i++)
gets(poem[i]);
char str[13];
int k = 0;
for (int i=0; i<4; i++){
str[k++] = poem[i][0];
str[k++] = poem[i][1];
str[k++] = poem[i][2];
}
//printf("k=%d\n", k);
puts(str);
return 0;
}
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