#include #include using namespace std; using namespace atcoder; typedef long long int ll; typedef long double ld; #define FOR(i,l,r) for(ll i=l;i=l;i--) #define RREP(i,n) RFOR(i,0,n) #define ALL(x) x.begin(),x.end() #define P pair #define F first #define S second #define BS(A,x) binary_search(ALL(A),x) #define LB(A,x) (ll)(lower_bound(ALL(A),x)-A.begin()) #define UB(A,x) (ll)(upper_bound(ALL(A),x)-A.begin()) #define COU(A,x) UB(A,x)-LB(A,x) templateusing min_priority_queue=priority_queue,greater>; using mint=modint1000000007; //using mint=modint998244353; signed main(){ ll N;string S;cin>>N>>S; mint ans=0; REP(i,10){ string T="yukicoder"; if(i<9)T[i]='?'; vectorDP(8); REP(j,N)REP(k,9)if(S[j]==T[k]){ if(k==0)DP[k]++; else if(k<8)DP[k]+=DP[k-1]; else ans+=DP[7]; } } cout<