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#include<stdio.h>#include<string.h>#include<math.h>char a[12];int L = 11;int count = 0;bool isPa(char a[]){int i = 0;while( i<6 ){if( a[i]!=a[10-i] ){return false;}i++;}return true;}int main(){int n;int i,j;scanf("%d",&n);for(i=0;i<n;i++){scanf("%s",&a);if( isPa(a) ){count++;}}printf("%d\n",count);return 0;}