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#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<string.h>
void main()
{
	char c;
	int a;
	gets(c);
	while(c!=' ')
	{
		a=(int)c;
		if(a>=97&&a<=123)
			puts(c);
		gets(c);
	}
}