#include <iostream>
using namespace std;
const int MAX_LENGTH = 100;
int main() {
int n, omega[MAX_LENGTH + 1], alpha[MAX_LENGTH + 1];
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> omega[i];
}
for (int i = 1; i <= n; ++i) {
if (i == 1) {
alpha[i] = omega[i];
cout << alpha[i] <<" ";
} else {
alpha[i] = omega[i] - omega[i - 1];
//cout << alpha[i] <<"<-";
if (alpha[i] < 0) {
int aux = alpha[i] * -1;
cout << aux <<". ";
} else {
cout << alpha[i] <<" ";
}
}
}
return 0;
}
/*
10
5 9 7 3 2 7 8 6 6 2
----------------------
*/
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