#include <iostream>
using namespace std;
int main(){
freopen("input.txt","r",stdin);
int T,x;
cin>>T;
for (x = 0; x < T; x++){
int N, i,j;
cin>>N;
char A[3][1000];
for (i = 0; i < 3; i++){
cin>>A[i];
}
int ans = 0;
for (i = 0; i < N; i++){
int dem = 0;
if (A[0][i]== A[1][i])
dem++;
if (A[0][i]== A[2][i])
dem++;
if (A[1][i]== A[2][i])
dem++;
if (dem < 3) ans= ans +2 - dem;
}
cout<<"#"<<x+1<<" "<<ans << endl;
}
return 0;
}
/*
10
97
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epuhxcmreljaegouhgmfqjwrncanyaotdssuhvbgpdendqpxrzefhtskchnmbowtvhdxrggpbczpkolnuvekgwgihjerbshgh
9
different
different
different
7
zenkoku
touitsu
program
100
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zaivaueigdylmwpotkvrzpzasuoctamjnbcmsvmdtinatcbwhdyoesismqjjekirbrgseuzcwpzjugjllskpbtkczaviegrzijak
1
a
a
a
4
west
east
wait
98
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qqowtmvbbzjhsfyrtsimtabichyxcmnvzxweqhnfdfrbpzfodemguugddtbjnhdpwqmwblgxzojszqtzsqxjxawzmbaiyewsfa
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99
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pueizefgzztxjbtavcrpyeckgohfqcyykjgmqsqocayhjttbaxeiarqdkayxittcojhpchvqojsxqzoyvustimctulztyamwbtx
pfebyoajkjvkmytgvtvpyeakgvhxzomyrjlxqsqccayqjotqabeidradsalmicaswihnetytukspqztuvostimctellysdmrpwi
100
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wmssykqlwpcxcqmnaclneavlzuvforkbdkmwmyxdatzlakrzjydgbaxsvafjfunbrdihjwvdqpbtjoppahrbrihwsibkicmndmgv
embgwrilgcmjqlsbnbikmmmlvhnktikndqsqoyfdlfnhigfjzdrhzzuvusukfkteajajwrvxugpuqktstduamoviqcylpotzvhfu
100
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*/