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#include <stdio.h>
int main (){
    int s=0;
    int k=0;
    int i=0;
    int a,n;
    while(scanf("%d%d",&a,&n)!= EOF){
        for(i=1;i<=n;i++){
            s = s*10+a;
            k = k+s;
            
        }
        k = k % 1000000007;
        printf("%d\n",k);

        
    }
    return 0;
}