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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
char letters[100000];
char article[100][10000];
int main(){
    int j,i = 0,k = 0,l = 0;
    while((letters[i] = getchar())!= EOF){
        i++;
    }
    for(j = 0; j < i; j++){
        if(letters[j] == '\n'){
            article[l][k] = '\0';
            k = 0;
            if(strlen(article[l])!=0) l++;
        }
        else if(letters[j]!=' '){
            if(j >= 1 && letters[j-1] == ' ' && !ispunct(letters[j]))
                article[l][k++] = ' ';
            if(letters[j]>='a'&& letters[j]<='z'){
                if(k == 0 || (k >=2 && article[l][k-2] == '.'))
                    letters[j] = letters[j]-32;
            }
            else if(letters[j]>='A' && letters[j]<= 'Z')
                    if(!(k >=2 && article[l][k-2] == '.')&& k > 0)
                        letters[j] = letters[j]+32;
            article[l][k++] = letters[j];
        }
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