#include <stdio.h>
#include <stdlib.h>
typedef int ElementType;
void solve(); // 做一次桶排序即可解决该问题
int main()
{
solve();
return 0;
}
void solve()
{
int i, n, tmp, age_count[51] = {0};
scanf("%d", &n);
for (i = 0; i < n; ++i) {
scanf("%d", &tmp);
++age_count[tmp];
}
for (i = 0; i < 51; ++i) {
if (age_count[i])
printf("%d:%d\n", i, age_count[i]);
}
}
