#include <stdio.h>
int main() {
int x[5],y[5],z[5];
int a,b,p=1,m,n,o=0,s;
for(int i=0;i<4;i++)
{
scanf("%1d",&x[i]);
y[i]=x[i];
z[i]=x[i];
}
for(int i=0;i<4;i++)
{
for(int j=0;j<4;j++)
{
if(y[i]>y[j])
{
b=y[i];
y[i]=y[j];
y[j]=b;
}
if(z[i]<z[j])
{
a=z[i];
z[i]=z[j];
z[j]=a;
}
}
}
for(int i=0;i<4;i++)
{
m+=y[i]*p;
n+=z[i]*p;
p*=10;
}
s=o;
o=m-n;
printf("%d",o);
}
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