#include using namespace std; using ll=long long; #define rep2(i, a, n) for(int i = (a); i < (n); i++) #define rep(i, n) rep2(i,0,n) #define mod 1000000007 int main(){ cin.tie(nullptr);ios_base::sync_with_stdio(false); ll a,b;cin>>a>>b; cout<