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Cod sursa(job #594064)
#include<cstdio>
using namespace std;
int n, m;
int is[30][30], p[1001][30];
int main() {
int i, j, k, rez = 0;
char c1, c2;
freopen("nrcuv.in", "r", stdin);
freopen("nrcuv.out", "w", stdout);
scanf("%d %d", &n, &m);
for(i = 1; i <= m; ++i) {
scanf("%c %c %c", &c1, &c1, &c2);
is[(int)c1 - 'a' + 1][(int)c2 - 'a' + 1] = 1;
is[(int)c2 - 'a' + 1][(int)c1 - 'a' + 1] = 1;
}
for(i = 1; i <= 26; ++i)
p[1][i] = 1;
for(i = 2; i <= n; ++i)
for(j = 1; j <= 26; ++j)
for(k = 1; k <= 26; ++k)
if(!is[j][k])
p[i][j] = (p[i][j] + p[i - 1][k]) % 104659;
for(i = 1; i <= 26; ++i)
rez = (rez + p[n][i]) % 104659;
printf("%d\n", rez);
return 0;
}