#include #include #include #include using namespace std; const int mod = 1000000007; void minusone(string &s){ reverse(s.begin(), s.end()); int carry = 1; for(int i = 0; carry > 0 && i < s.length(); i++){ carry = s[i] == '0'; s[i] = (s[i] == '0' ? '9' : s[i]-1); } reverse(s.begin(), s.end()); if(s.length() > 1 && s[0] == '0') s = s.substr(1); } // index - less - has three - modulo three - modulo eight int dp[10001][2][2][3][8]; int f(string s){ memset(dp, 0, sizeof(dp)); int n = s.length(); dp[0][0][0][0][0] = 1; for(int i = 0; i < n; i++){ for(int j = 0; j < 2; j++){ for(int k = 0; k < 2; k++){ for(int l = 0; l < 3; l++){ for(int m = 0; m < 8; m++){ for(int num = 0; num <= 9; num++){ if(j == 0 && num > s[i]-'0') continue; int ni = i+1; int nj = j | (num < s[i]-'0'); int nk = k | (num == 3); int nl = (10*l+num)%3; int nm = (10*m+num)%8; dp[ni][nj][nk][nl][nm] += dp[i][j][k][l][m]; dp[ni][nj][nk][nl][nm] %= mod; } } } } } } int ret = 0; for(int j = 0; j < 2; j++){ for(int k = 0; k < 2; k++){ for(int l = 0; l < 3; l++){ if(k == 0 && l != 0) continue; for(int m = 1; m < 8; m++){ ret += dp[n][j][k][l][m]; ret %= mod; } } } } return ret; } int main(){ string a, b; cin >> a >> b; minusone(a); cout << (f(b)-f(a)+mod)%mod << endl; return 0; }