include <stdio.h>#include <stdlib.h>#include <string.h>int main(){char s[100]={'\0'};scanf("%[^\n]",s);int len=strlen(s);int i,j=0;for(i=0;i<len;i++){if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')){s[j++]=s[i];}else...