#line 1 "a.cpp" #include using namespace std; #line 3 "/home/kotatsugame/library/math/modint.cpp" #include template struct modint{ unsigned int x; constexpr modint()noexcept:x(){} constexpr modint(long long _x)noexcept:x((_x%=m)<0?_x+m:_x){} constexpr unsigned int val()const noexcept{return x;} constexpr modint&operator++()noexcept{if(++x==m)x=0;return*this;} constexpr modint&operator--()noexcept{if(x==0)x=m;--x;return*this;} constexpr modint operator++(int)noexcept{modint res=*this;++*this;return res;} constexpr modint operator--(int)noexcept{modint res=*this;--*this;return res;} constexpr modint&operator+=(const modint&a)noexcept{x+=a.x;if(x>=m)x-=m;return*this;} constexpr modint&operator-=(const modint&a)noexcept{if(x>=1)if(n&1)r*=x; return r; } constexpr modint inv()const noexcept { int s=x,t=m,x=1,u=0; while(t) { int k=s/t; s-=k*t; swap(s,t); x-=k*u; swap(x,u); } return modint(x); } friend constexpr modint operator+(const modint&a,const modint&b){return modint(a)+=b;} friend constexpr modint operator-(const modint&a,const modint&b){return modint(a)-=b;} friend constexpr modint operator*(const modint&a,const modint&b){return modint(a)*=b;} friend constexpr modint operator/(const modint&a,const modint&b){return modint(a)/=b;} friend constexpr modint operator==(const modint&a,const modint&b){return a.x==b.x;} friend constexpr modint operator!=(const modint&a,const modint&b){return a.x!=b.x;} friend ostream&operator<<(ostream&os,const modint&a){return os<>(istream&is,modint&a){long long v;is>>v;a=modint(v);return is;} }; #line 4 "a.cpp" using mint=modint<(int)1e9+7>; mint dp[10101][2][2][24]; mint f(string A) { for(int i=0;i<=A.size();i++)for(int j=0;j<2;j++)for(int k=0;k<2;k++)for(int l=0;l<24;l++)dp[i][j][k][l]=0; dp[0][0][0][0]=1; for(int i=0;i>A>>B; for(int i=A.size();i--;) { if(A[i]=='0')A[i]='9'; else { A[i]--; break; } } cout<