///all delete except lowercase

#include<stdio.h>
#include<string.h>
#include<math.h>


char a[100],b[100];

void dlt(int pos)
{
    int i=pos;
    while(a[i]!='\0')
    {
        a[i]=a[i+1];
        i++;
    }
}


int main()
{
    gets(a);

    int i=0;

    while(a[i]!='\0')
    {
        if(a[i]>='a' && a[i]<='z') i++;
        else dlt(i);
    }

    puts(a);

    return 0;
}