#include <iostream>
#include <stdio.h>
using namespace std;
FILE *f,*g;
int main()
{
    int n,cop;
    f=fopen("input.in","r");
    g=fopen("output.out","w");
    fscanf(f,"%d ",&n);
    cop=0;
    while(n>0)
    {
        cop=cop*10+n%10;
        n/=10;
    }
    while(cop>0)
    {
        if((cop%10-1==cop/10%10)||(cop%10+1==cop/10%10))
        {
            fprintf(g,"%d-",cop%10);
            cop/=10;
        }
        else
        {
            fprintf(g,"%d",cop%10);
            cop/=10;
        }
    }
    return 0;
}