include <stdio.h>

include <string.h>

int main(void)
{
long a[10000] = {0};

long i = 0;
long j,k;
long num = 0;

scanf("%ld", &num);
getchar();
char str[100];
long c;
long d;
char spit  = ' ';

for(i = 0;i < num;i++)
{
    fgets(str,sizeof(str), stdin);
    // getchar();
    sscanf(str, "%ld %ld %c", &c, &d, &spit);
    // printf("%ld, %ld\n",c,d);
    bzero(str,0);
    a[c] += d;

}
for(i = 0;i < 10000;i++)
{
    if(a[i] == 0)
        continue;
    printf("%ld %ld\n", i,a[i]);

}

return 0;

}