#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>


int main () {
char vetor[100],aux;
int n,i;
printf("Digite a frase: ");
gets(vetor);
n = strlen(vetor);

for(i=0;i<n;i++){
aux = vetor[i];
    if (i%2 == 0){
        vetor[i] = (toupper(aux));}
    else {
        vetor[i] = (tolower(aux));}
}
printf("Frase nova: %s \n\n", vetor);

return 0;
}