#include #include #include using namespace std; int len; string s; int memo[10001][2][4][8]; int mod = 1000000007; bool out(int a, int l, int r){ return a=0) return memo[d][border][thr][egh]; int md = border==0?9:s[d]-'0'; int ans = 0; for(int i=0; i<=md; i++){ int nb = border&(i==md?1:0); int nthr; if(thr==3 || i==3) nthr = 3; else nthr = (thr*10+i)%3; ans = (ans+dfs(d+1, nb, nthr, (egh*10+i)%8))%mod; } return memo[d][border][thr][egh] = ans; } int calc(string str){ s = str; len = str.size(); for(int i=0; i> a >> b; cout << ((calc(b)-calc(a)+valid(a)+mod)%mod) << endl; return 0; }