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Cod sursa(job #562816)
#include <fstream>
#define MOD 104659
using namespace std;
int a[26][1001],n,p[26][26];
int main(){
ifstream fin("nrcuv.in");
fin>>n;
int m;
fin>>m;
for( ; m ; --m){
char x,y;
fin>>x>>y;
x-='a', y-='a';
p[x][y]=p[y][x]=1;
}
for(int i=0;i<26;++i)
a[i][1]=1;
for(int j=2;j<=n;++j)
for(int i=0;i<26;++i){
int s=0;
for(int k=0;k<26;++k)
if(p[i][k]==0)
s=(s+a[k][j-1]) % MOD;
a[i][j]=s;
}
ofstream fout("nrcuv.out");
int s=0;
for(int i=0;i<26;++i)
s = (s+a[i][n])% MOD;
fout<<s<<endl;
return 0;
}