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Cod sursa(job #852769)
#include<stdio.h>
#define MOD 104659
int d[1005][26];
int ad[26][26];
int main()
{
freopen("nrcuv.in","r",stdin);
freopen("nrcuv.out","w",stdout);
int n,m,i,last,llast;char a,b;
scanf("%d %d",&n,&m);getchar();
for(i=1;i<=m;i++)
{scanf("%c %c",&a,&b);ad[a-'a'][b-'a']=ad[b-'a'][a-'a']=-1;getchar();}
for(last=0;last<26;last++) d[1][last]=1;
for(i=2;i<=n;i++)
for(last=0;last<26;last++)
for(llast=0;llast<26;llast++)
if(ad[llast][last]==0)
d[i][last]=(d[i][last]+d[i-1][llast])%MOD;
for(i=1;i<26;i++)
d[n][0]=(d[n][0]+d[n][i])%MOD;
printf("%d\n",d[n][0]);
return 0;
}