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Cod sursa(job #194032)
#include <stdio.h>
#include <stdlib.h>
#define N 30
#define MAX 1010
//int cine[N][N];
//int cati[N];
int n,m;
int v[N][N];
int a[MAX][N];
int main(void){
int i,j,k,x,y,s;
char aa,bb;
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
scanf("%d%d\n",&n,&m);
for (i=1;i<=m;++i){
scanf(" %c %c",&aa,&bb);
x=aa-'a'+1;
y=bb-'a'+1;
v[x][y]=1;
v[y][x]=1;
}
for (i=1;i<=26;++i)
a[1][i]=1;
for (i=2;i<=n;++i){
for (j=1;j<=26;++j){
for (k=1;k<=26;++k)
if (!v[k][j])
a[i][j]=(a[i][j]+a[i-1][k])%104659;
}
}
s=0;
//for (i=1;i<=26;++i)
//printf("%d ",a[1][i]);
//printf("\n");
//for (i=1;i<=26;++i)
//printf("%d ",a[2][i]);
//printf("\n");
for (i=1;i<=26;++i)
s+=a[n][i];
printf("%d\n",s%104659);
return 0;
}