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#include <cstdio>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <bitset>
#include <stack>
#include <string>
#include <cstring>
#include <cassert>
#include <limits.h>

using namespace std;

typedef long long LL;
typedef long double LD;

typedef vector<int> VI;
#define REP(i,n) for(int i=0;i<(n);i++)
#define FOR(i,a,b) for(VAR(i,a);i<=(b);++i)
#define FORD(i,a,b) for(VAR(i,a);i>=(b);--i)
#define FORE(a,b) for(VAR(a,(b).begin());a!=(b).end();++a)
#define VAR(a,b) __typeof(b) a=(b)
#define SIZE(a) ((int)((a).size()))
#define ALL(x) (x).begin(),(x).end()
#define CLR(x,a) memset(x,a,sizeof(x))
#define ZERO(x) memset(x,0,sizeof(x))
#define S(t,i) scanf("%" ## t, &i)
#define SI(i) scanf("%d", &i)

const int MAXN=1000000+11;
int n;
int a[MAXN];
int b[MAXN];
LL ans;

LL compute(LL l) {
    return l*(l-1)/2+l;
}

int main() {
    ios_base::sync_with_stdio(0);
    a[0]=99;
    scanf(" ");
    while(true) {
        char ai;
        scanf("%c", &ai);
        if (ai < '0' || ai > '9') {
            break;
        }
        n++;
        a[n] = ai-'0';
    }
    scanf(" ");
    FOR(i, 1, n) {
        char ai;
        scanf("%c", &ai);
        a[i] += ai-'0';
    }
    scanf(" ");
    FOR(i, 1, n) {
        char ai;
        scanf("%c", &ai);
        b[i] = ai-'0';
    }

    // FOR(i, 1, n) {
    //     printf("%d ", a[i]);
    // }
    // printf("\n");
    // FOR(i, 1, n) {
    //     printf("%d ", b[i]);
    // }
    // printf("\n");


    int i=n;
    while (i>0) {
        bool correct=true;
        LL l=0;
        int carry=0;
        while (correct) {
            if (a[i]==b[i]) {
                if (carry) {
                    correct = false;
                    ans += compute(l);
                } else {
                    l++;
                    carry=0;
                    i--;
                }
            } else if (a[i]-10==b[i]) {
                if (carry) {
                    correct = false;
                    ans += compute(l);
                } else {
                    carry = 1;
                    i--;
                }
            } else if (a[i]-10+1==b[i]) {
                if (carry) {
                    i--;
                    carry = 1;
                } else {
                    correct = false;
                    ans += compute(l);
                    i--;
                }
            } else if (a[i]+1==b[i]) {
                if (carry) {
                    l++;
                    carry = 0;
                    i--;
                } else {
                    correct = false;
                    ans += compute(l);
                    i--;
                }
            } else {
                correct = false;
                ans += compute(l);
                i--;
            }
        }
    }

    printf("%lld\n", ans);
    return 0;
}