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#include<stdio.h>
int main()
{
long int a,b,c,i = 0,j,n = 1,m,mun[500];
while( 1 )
{
scanf("%d%d",&a,&b);
if( a == 0 && b == 0 )
break;
if( a > b )
{
c = a;
a = b;
b = c;
}
j = 0;
for( ; a <= b; a++ )
{
m = a;
while( m != 0 )
{
n = m % 10;
if( n == 1 )
j++;
m = m / 10;
}
}
mun[i] = j;
i++;
}
for( j = 0; j < i ; j++ )
printf("%d\n",mun[j]);
return 0;
}
sum=0;
if(A>1) sum += A*n3 + 1000
else if(A==1)sum += A*n3 + BCD
if(B>1) sum += B*n2 + 100
else if(B==1)sum += B*n2 + CD
if(C>1) sum += C*n1 + 10
else if(C==1)sum == C*n1 + D
if(D>=1) sum+=1