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#include<stdio.h>
void main()
{
	char c[100],ch;
	int i,j,k;
	puts("enter string\n");
	gets(c);
	for(i=0;c[i]!='\0';i++)
	{
		ch=c[i];
		if(ch>=97&&ch<=122)
	        putchar(ch);
	}
}