#include <stdio.h>
#include <ctype.h>
#include <string.h>
 
int islast(char *word){
	int i;
	for(i=0;word[i]!='\0';i++)
		if(ispunct(word[i]))
			return 1;
	return 0;
}
 
int canprint(char *printname){
	if((strcmp(printname,"of")==0)||(strcmp(printname,"and")==0)||
		(strcmp(printname,"the")==0)||(strcmp(printname,"at")==0))
		return 0;
	return 1;
}
 
main(){
	char name[1000][1000][127]={'\0'};           //group, word, char
 
	int i=0,j;
	for(j=0;scanf("%s",name[i][j])!=EOF;j++){
		if (islast(name[i][j])==1){
			i++;
			j=-1;
		}
	}                 //scan all words
 
	int a,b;
	for(a=0;a<i;a++){
		for(b=0;name[a][b][0]!='\0';b++)
			if(canprint(name[a][b])==1)
				printf("%c",toupper(name[a][b][0]));
		printf(" ");
	}
}

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dGhlIGNpdmlsIHdvcmtzIGFkbWluaXN0cmF0aW9uLiBmaWxlIHRyYW5zZmVyIHByb3RvY29sLiBjaGllZiBleGVjdXRpdmUKb2ZmaWNlci4gbm8gcHJvYmxlbS4gdGhlIHNvY2lhbCBzZWN1cml0eSBhZG1pbmlzdHJhdGlvbi4gYW50ZSBtZXJpZGllbS4KZ3Jvc3MgbmF0aW9uYWwgcHJvZHVjdC4gY2xvc2UgcXVhcnRlcnMgY29tYmF0LiB0aGUgYWdyaWN1bHR1cmFsIGFkanVzdG1lbnQKYWN0LiBkeW5hbWljIGhvc3QgY29uZmlndXJhdGlvbiBwcm90b2NvbC4gdGhlIGNpdmlsaWFuIGNvbnNlcnZhdGlvbiBjb3Jwcy4KdW5pdGVkIHN0YXRlcyBnZW9sb2dpY2FsIHN1cnZleS4gY3JpbWUgc2NlbmUgaW52ZXN0aWdhdGlvbi4=

the civil works administration. file transfer protocol. chief executive
officer. no problem. the social security administration. ante meridiem.
gross national product. close quarters combat. the agricultural adjustment
act. dynamic host configuration protocol. the civilian conservation corps.
united states geological survey. crime scene investigation.