problem D

#include<stdio.h>
#include<string.h>
  char word[150];
    char nword[150];
    char nword1[150];
int main(){
for(int i=0;i<150;i++){
    word[i] = '\0';
    nword[i] = '\0';
    nword1[i] = '\0';
}
    scanf("%s",word);
    int j=0;
    int len = strlen(word);
    for(int i=0;i<len;i++){
        if(word[i]!='a' && word[i]!='A' && word[i]!='e' && word[i]!='E' && word[i]!='i' && word[i]!='I' && word[i]!='o' && word[i]!='O' &&  word[i]!='u' && word[i]!='U' && word[i]!='Y' && word[i]!='y'){
            nword[j] = word[i];
            j++;

        }
    }

int len1 = strlen(nword);
int len2 = 2 * len1;

int p =0;
for(int i=0;i<len2;i++){
        if(i%2==0){
            nword1[i] = '.';

        }
        else {
            nword1[i] = nword[p];
            p++;
        }
    }
char let1 = 'a';
char let = 'A';
char u_case[26];
char l_case[26];
for(int i=0;i<26;i++) {
        u_case[i] = let;
        l_case[i] = let1;
        let++;
        let1++;
    }
 int ln= strlen(nword1);
    for(int i=0;i<ln;i++){
        for(int j=0;j<26;j++){
            if(nword1[i]==u_case[j]){
                nword1[i] = l_case[j];
            }
        }


        }

  printf("%s\n",nword1) ;

    return 0;
}